Framing device for spot flood lamps



Wow. 118, 11924.

J. W. BRENKERT EIT AL l' l, FRAMING DEVICE FOR SPOT FLOOD LAMPS Filed Dec. 1 6, 1922 Patented Nov. 18, 1924i.

JOSEPH W. BRENKERT, 0F DETROIT, MICHIGAN, AND KARL BRENKERT, 0F SAN DIEGO, CALIFORNIA.

FRAMING DEVICE FR SPOT FLOOD LAMPS.

Application filed December 16, 1922. Serial No. 607,289.

To all lwhom t may concern:

Be it known that we, (a) JOSEPH W. BRnNnnn'r and (b) KARL BRENKERT, citizens of the United States of America, residing at (a) Detroit, in the county oi" lWayne, State of Michigan, and San Diego, in the county of San Diego, State ci California, have invented certain new and useful improvements in Framing Devices for Spot Flood Lamps, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a framing device for spot flood lamps, and our invention aims to eliminate the use of cardboard and sheet metal frames heretofore employed ior reducing the eifective light projecting area of a lamp house aperture, said boards or trames ordinarily being manually manipulated exteriorly of a lamp house to either increase or decrease the size of a lamp house aperture, so that a ray of light may tlood an ent-ire stage, a proscenium, or be directed to a particular spot on or about the stage.

Our invention further aims to provide a built-in fra-ming device embodying shutters or frames movable in synchronism, said shutters or frames having openings with the marginal edges of the openings cooperating either to increase or decrease the eiective light projecting area of the lamp, within a housing which incloses the built-in framing device. The shutters or frames are supported for simultaneous operation by a mechanism operatable outside of the lamp house, at either end thereof, according to the manner in which the lamphousing is constructed, consequently an operator can easily and quickly shift the shutters or frames, either for dowsing or for producing a desired lighting effect on a stage, and it is in this connection that our frame or shuttering mechanism does not interfere with the use of a color wheel, iris shutter or any other attachment for producing a desired stage effect.

Our invention further aims to embody a framing device in a lamp house in such a manner that said device cannot bind or become distorted to the extent of becoming inoperable because of heat or other conditions within a lamp house. The movable parts of the framing device are shielded and protected from intense heat and in one form of our invention are disposed so as to be operated by a minimum number of compactly arranged parts.

r)The above are a few of the features of our invention and others will appear as the nature of the invention is better understood by aid of the drawing, wherein- Figure 1 is a side elevation oi a lamp house in accordance with our invention;

Fig. 2 is a front elevation;

Fig. 8 is an enlarged elevation of the inner wall of the lamp house;

Fig. 11 is a similar View showing a lens holder removed and illustrating the slidable shutters or 'frames of our device;

Fig. 5 is a vertical longitudinal sectional view of the same; v y

Fig. 6 is a horizontal sectional view taken on the line Vl-VI of Fig. 3, and

Fig. 7 is a perspective View of a portion of a lamp house illustrating a slight modification of our invention.

ln the drawing, the reference numeral 1 denotes, by the way of an example, a lamp house having, among other things, a front wall 2, a rear wall 3, and a support 4 on which the lamp house is adjustably supported so that it may be tilted or bodily swung in a desired direction. The front wall 2 of the lamp house has a large aperture 5 and mounted in said lamp house, in spaced relation to the inner face of the front wall 2, is a lens holder 6. This lens holder can be conveniently attached to opposed guide bosses 7 carried by the inner face of the :front wall 2, and slidable between the lens holder 6, the front wall 2, and the guide bosses 7 are channel shutters or frames 8 and 9, the latter being slidable in the former so that said shutters are somewhat telescopic and cannot become accidentally displaced on account of being sandwiched between the front wall 2 and the lens holder 6.

The shutters 8 and 9 are provided with openings 10 adapted to register, as shown in Fig. 4, the opening of the shutter 9 having an upper straight edge 11 and a lower semicircular edge 12. The opening of the shutter 8 has a lower straight edge 13 and an upper semi-circular edge 14,. The radius by which the semi-circular edges 12 and 14 are described corresponds to the radius of the wall aperture 5 so that when the shutters 8 and 9 are in extreme open positions the shutter opening will be in matched relation with the wall aperture 5.

The lower ends of the shutters 8 `and 9 E are reduced and provided with central vertical slots 15 providing clearance for the hub portion 16 of a rock arm 17 mounted on a shaft 18, journaled in a bearing 19 carried by the front wall 2 of the lamp house. rllhe 1U ends of the rock arm 17 have oppositely ex- .tendin ipins ,oistuds 20 extending into slots Y2,1 o-fflie shutters .8 and 9, and on the outer .end of the shaft 18jis a crank or handle 22 by which the shaft 18 can be rocked in the l-i bearing19 to actuate the arm 17 and cause ytheshutters 8 and 9 tobe shifted in syn- 'chronismand in opposite directions, one of the shutters being raised ywhile the other is ylowered vor vice versa.

'-f By. swinging thej crank 22 in one direction the shutters 8 .and 9 `are shifted to a wide open.pos ition providing an openingfcorrespending in area to that of the aperture 5, ,and byswinging the crank in an opposite di- 45 rection the shuttersS Aand 9 assume a closed position by reason. of the st aight edges 11 y.a1 1d:13 .of .the shutters moving ,towards each other. It is this last mentioned movement that Y permits of -avflood of light being framed w so that rays of rlight will be directed in a desired direction to illuminate a desired area. lThis .will obviate'thenecessity of placing frames in front of the aperture 5, although the front wall2 of the lampihousinghas :ifs r,braclgetsor ,guides 23 permitting of color wheels, iris shutters and ,other .devices being xvused inconnection. with the lamp house.

.,Theacrank or handle v22-is operatable at the front end of the lamp house, but asv illus- .tratedin Fig.,7,-wemayrprovide means for operating theshutters/from the rear wall 3 ,of the v.lamp house. As an example of such .meanslthere may ,be a longitudinally dis- `posed, rock shaft 211 supported by the bottom 45') .wall of the lamp house with the rear end of 'the'y shaft 24 provided-with a crank or hanidle 25land the `forward end of said shaft conneetedbya Grana-l` 26 and a link 27 to the eiganl .orhandle22 of the shaft 18.

U `Enom, theforegoing it `will be observed vdo not care 'to confine ourselves to the precise construction shown, other than defined by the appended claims.

lWhat we claim is 1. ln a framing .device for spot flood lamps wherein a lamp house has a front wall provided with anaperture z-fraines slidable in the lamp house and havingadjacent slotted` ends contiguous to the aperture of the front wall of said lamp house, said frames havingopenings with marginal edges `of said openings cooperating to eitherincrease or decrease the effective light projecting area of the lamp house aperture, and means in the lamp house front wall below the aperture thereof adapted for engagement in the adjacent slotted ends of saidl frames for shifting said frames in synchronism.

2. A framing device as called for in claim 1, wherein said means includes a rock shaft j ournalcd in the lamp house anda rock arm on said shaft having its ends loosely engaging in the slots of said frames.

3.111 a lamp house, channel shutters one `slidable in the other with the channel flanges of one of said shutters affording a space between said shutters, guiding means for said shutters, and rocking means in the space between said shutters adapted for raising and loweringy said shutters.

In testimony whereof we affix our signatures -in presence of two witnesses.

JOSEPH lV. BRENKERT. KARL BRENKERT.

lWitnesses z ABRAM B. BONMAN, WILLIAM E. HALL. 

